Hey David, the easiest way to figure out the minor keys is to know your relative major/minor keys. Each major key shares the exact same notes as another minor key.

For the key of G minor it’s relative major key is Bb major. Therefore, Bb major uses the exact same notes as G minor so you can simply visualize your Bb major pentatonic scales when improvising over a G minor chord progression and those scale forms suddenly become G minor pentatonic without having to think about anything else. 🙂